Unable to find service manual for techs to use to fix amplifier
I bought an XMS503 AV Receiver about 18 months ago, new. Had some problems from the start with the sound cutting out and static would take over. This happened only a couple of times and because of one reason or another, I wasn't able to get the unit back to Strathfield in Hyde Park, Townsville, where I bought it. I haven't used it in about a year and I recently hooked it up and the problem is still there, only it is happening nearly every couple of minutes.
If you press the coaxial button on the remote, or switch it to another unit eg. vcr, then back again and the sound comes back. But after a couple of minutes the sound dissapears and the static comes back!
I put it into a repair shop and they charged me $55 to be able to not fix it. The guy said that he could not find the fault, said the manual volume button was also stuffed and that he needed the service manual or specs for the unit
Strathfield have shut down in Townsville and I have called Head Office and all they say is that their policy is to replace the unit if it is under warranty and if it is not.....too bad! They say there is no-one they know who can obtain the specs the techs need and simply don't want to know about my problem! This unit cost me around $500 and I have hardly used it, and I am not working, so $$$$ are few and far from each other. I was hoping to download the nescessary files but can find no reference for them anywhere. So here I am, writing to you in the hope you are able to give me some advice which will help.
Thanks for your time in reading this
Glenn A. Firth
You said Unit is enclosed!!
Does that mean it is inside something?
Receivers & Amps need to have a clearance above them so air can circulate, otherwise you'll have an overheating problem.
You also might have some of your wires crossed which will cause the Amp to shut down. Look at all your connections and make sure they're correct, including speaker wires.
No fix to this problem. When my T763 had the same symptoms I left it with the dealer who sent it on to service. It ended up being scrapped. So I'm afraid this is the end of your receiver unless your techies are better than the ones who worked on mine.
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Update firmware (usually every 6 months). Connect the ethernet to the unit, press Net and Power button simultaneously. Hit Enter as directed. Takes up to 60 minutes. OR (if no internet service), download firmware updates onto a USB (32MB) and connect it to the USB port. If you do not update voluntarily, unit will suddenly not feed video.
hi, First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the overload (protect) show or not . if not, then any of the speaker is damaged or you have to check the impedence of your receiver and speakers. It will be written on the rear side of both receiver and speakers in ohms. PIONEER recommend to connect 8 ohms speakers in to this AV receiver. If you are using 6 ohms speakers you have to do some setting in the AV receiver.For that do the following
1. With the receiver in standby, press STANDBY/ON while holding down the SPEAKER IMPEDANCE button.( Each time you do this, you switch between the impedance settings: )
SP 6 OHM - Use this setting if your speakers are rated at 6 Ohms
SP 8 OHM - Use this setting if your speakers are rated at 8 Ohms or more
You are not able to connect speakers with impedence bellow 6 Ohms with this receiver. Becuse the AV receivers impedence range is 6 - 16 Ohms.
If then also it shows protect you have to check the amplifiers hardware.
AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong. Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer throughdisplay that PROTECT. You have to check the amplifier. for that you need digital multimeter,soledring iron screwdrivers etc open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one. after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial. You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistorsreplaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself. After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check connect the power and check. If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components. ok
If you don't want to buy new speakers, settle for safer low volume levels.
You're going to kill that receiver driving a 3-ohm load. HTS-style speakers aren't reliably re-deployable to other electronics. Perhaps, if you have 4 speakers and they're similar you could wire them in SERIES and present a 6-ohm load to each channel.
Re-engineering the speakers themselves is, well, don't do it. It isn't rocket science but it also isn
First make sure all connections are firmly in place. Not only speakers, but any other inputs too.
swop the left and right channels over at the amplifier end. If the sound happens on the other speaker now, you have a faulty av receiver. If it's still on the same speaker, that speaker is "broken" and requires replacing.
Flashing standby light shows that protection mode is activated in receiver because of some problem in output amplifier section. Please check output amplifier section and replace defective component to fix the issue.
Sounds like the music amplifier is different to the tuner audio amp. The music amplifier is now looking at an unbalanced impedance which is less than it should be. Therefore the output chip of the music amp has more current through it than it wants so it gets hot and shuts down.Put a four ohm wirewound resistor ( from Radio Shack ) in series with each surround speaker to reduce the current flow through the amplifier output.
The display problem is because the solderings on the back of the display are broken. To fix it you have to open the amp and redo the solderings (there are about 50 or 60 of them). There is a Youtube video that shows how to do it. I have fixed this on my DSP-A1. I also have the problem with the motorized volume control. I have tried cleaning it, and it works for a few days, then it's stuck again. I guess I will have to replace it to have it fixed permanently. The part number is VZ621400, a new one costs about 40$.